Java: Get an element in a tree set which is strictly less than the given element

Last update on May 22 2025 13:14:21 (UTC/GMT +8 hours)

13. TreeSet Lower Element

Write a Java program to get an element in a tree set that has a lower value than the given element.

Sample Solution:

Java Code:

import java.util.TreeSet;
import java.util.Iterator;

  public class Exercise13 {
  public static void main(String[] args) {
 // creating TreeSet 
   TreeSet <Integer>tree_num = new TreeSet<Integer>();
   TreeSet <Integer>treeheadset = new TreeSet<Integer>();
     
   // Add numbers in the tree
   tree_num.add(10);
   tree_num.add(22);
   tree_num.add(36);
   tree_num.add(25);
   tree_num.add(16);
   tree_num.add(70);
   tree_num.add(82);
   tree_num.add(89);
   tree_num.add(14);
   
   System.out.println("Strictly less than 69 : "+tree_num.lower(69));
   System.out.println("Strictly less than 12 : "+tree_num.lower(12));
   }    
}

Sample Output:

Strictly less than 69 : 36                                             
Strictly less than 12 : 10

Flowchart:

For more Practice: Solve these Related Problems:

Write a Java program to use the lower() method on a TreeSet to retrieve the greatest element that is strictly less than a given value.
Write a Java program to implement a custom method that finds the element just below a given value in a TreeSet using iteration.
Write a Java program to compare the lower() method with a manual search method and print both results for a given input.
Write a Java program to use Java streams to filter elements less than a given value and then pick the maximum among them.

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Java Code Editor:

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